Chapter 19, Problem 19.29QP

Interpretation Introduction

Interpretation:

A cell made up of ${\text{Zn/Zn}}^{\text{2+}}$ and ${\text{Cu/Cu}}^{\text{2+}}$ half-cells at 25°C

$\left[{\text{Zn}}^{\text{2+}}\right]\text{ =0}\text{.25M}$ and $\left[{\text{Cu}}^{\text{2+}}\right]\text{ = 0}\text{.15M}$ are given.

The potential of the given cell should be determined.

Concept Introduction:

• A half reaction in redox process is a chemical equation representing only the oxidation or only the reduction of an oxidation reduction reaction of an oxidant ion reaction.

  Add both the half-reactions, the electron cancel and we obtained the balanced overall (redox) equation.

• Half-reaction in a galvanic cell take place in separate compartments called salt bridge.

  As the reaction progress, Galvanic cell generate a flow of electrons through the wire and thereby generate electricity

• Redox reaction are those in which oxidation number changes.
• Half reaction are the separated oxidation and reduction reaction that make up the overall redox reaction.

  Example, the Zn-Cu battery, the two half cells make an oxidizing couple.

  Key formula:

  Formula for standard emf-

  ${\text{E}}^{\text{0}}{\text{= E}}^{\text{o}}\text{-}\frac{\text{0}\text{.0592 V}}{\text{n}}\text{ logQ}$

To determine: The potential of the given cell should be determined.